<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>矩阵置零</title>
</head>
<body>
  <script>
    function fn(matrix) {
      var row = matrix.length;
      var col = matrix[0].length;
      var map1 = {};
      var map2 = {};
      for (var i = 0; i < row; i++) {
        for (var j = 0; j < col; j++) {
          if (matrix[i][j] === 0) {
            map1[i] = i
            map2[j] = j
          }
        }
      }
      for (var i in map1) {
        for (var j = 0; j < col; j++) {
          matrix[i][j] = 0
        }
      }
      for (var i in map2) {
        for (var j = 0; j < row; j++) {
          matrix[j][i] = 0
        }
      }
      return matrix
    }
    console.log(fn([1, 1, 1], [1, 0, 1], [1, 1, 1]))
  </script>
</body>
</html>